Convert image to base64 using java

Question

I need to convert an image object to a base64 object so that I can load it into a tag on my client side.

However, I cannot figure out how to do this. Does anyone have a code for this that I could easily use?

This is what I use to turn an external image link into an image object

Image image = null; URL url = new URL(request.getParameter("hdn_path")); image = ImageIO.read(url); 

Not sure if I will do it right.

Answer 1

Using Apache IOUtils and Base64

 byte[] imageBytes = IOUtils.toByteArray(new URL("..."))); String base64 = Base64.getEncoder().encodeToString(imageBytes); 

Answer 2

• write using ImageIO.write ().
• ByteArrayOutputStream wraps an array of bytes, so it can be used as an output stream.
• convert byte array to base64 string using DatatypeConverter, in Java kernel with 6, no additional libraries required

Example

 ByteArrayOutputStream output = new ByteArrayOutputStream(); ImageIO.write(image, "png", output); DatatypeConverter.printBase64Binary(output.toByteArray());